Concentration of the emission spectrum of broad-band solid-state lasers

Concentration of the spectrum of broad-band laser radiation was observed experimentally in the near infrared (Δλ≈700–1200 nm). This was due to a change in the optical properties of an alexandrite crystal in the absence of a plasma in its resonator and due to locking of the emission frequency near absorption lines of excited transitions in cyanogen, water vapor, and metal vapors. Characteristics of this effect and also its practical application for diagnostics of plasma objects are discussed.